Centrifugal pump.



UNrrEn 'srA'rEs PATENT fELoE or rruEN'roN, NEWV JEirsEY, AssieNoR 'roTHE JEANEsviLLE IRON wenns coureur, or i-iAZLE'roN, PENNSYLVANIA, A.coRPoRA ;1T1O'N sereinement Application filed April T @ZZ whoml tmayconccrn:

Be itlmown'that I, ELOF MEDEN, a sub ject of the King of Sweden,residing in the city of Trenton, in the county of Mercer,-

'compound centrifugal-pump provided with my invention. In this .instanceI havel illustrated the pump as .constructed withf four stages, `but itwill be understood that more or fewerinay be employed as desired.

Thev runners or iinpellers,whichare marked A,`A,' A2, A, are mountedupon the main shaft' S so as to turn therewith, and this shaft runs inbearings B, B', carried by the casing C. u The suction inlet for thewater is at D andthe outlet is atvtlie opposite eiidof the casing aslindicated by the dotted circles E in the figure.

Between the impellers or runners A, A",

vare the series'of stationary partitions G and H, forming channels F,F', F2, leading from the periphery of vone iinpeller to 'near the hubofthe next, as usual. tween each impeller (A for example) and thesucceeding set of channels (F), preferably, extends down to the hub ofthe next following impeller (A), so that each impeller has all itseffective parts running within its own chamberu. The pressure in eachchamber a in which an impeller runs is approximately charges its waterat its periphery, and as that is greater than at the point where thevwater enters that im eller, it follows that there will I form or securein the inner face of the rear The partition G be-` S'pecication ofLetters Patent.

5,1905. Serial' No. 253,979.-

that at the point where that iinpcller di-s- CSENTRlFue/ii. PUMP.-

Efatented Apr/i1 23, 1907.

end of the casing C a hollow ring J of a diameter, which mayconvenientlybe about equal sion side of imp'eller A, where it projectsthrough the partition II. An annular ange t3 on the adjacent face ofthis iiiipeller forms a lap joint with the forward face of thisA ring'iSS to the diameter of the ring face of the admisso that these twoparts form the three sides of a chamber K, whose fourth side is closed,

by the shouldered endv or plug I of a sleeve O,

which is mounted on and turns with the shaft S. This sleeve has a screwthread connection with the shaft ata: so that by turning thev sleeve onAthe shaft, the sleeve andl its sliouldered or plug end can be adjustedon the shaft; and this can be done from the outside of the casing forthesleeve projects through a stuifing box R in the end of the casing. Alock nut p may be used to lock the sleeve in its adjusted posit-ion.

Back of the chamber- K is chamber M, .i

this trapped body ofwater .will take the end thrust. V

If there is end tl cum'ulation of leakage of water into it from thechamber lin which the last iinp elle1"ruiis,I the' shaft will carry the.plugl) to the right 'ust to the right from ex' cess of pressure in thechamber K, due to ac.

sufficiently to momentarily open the. chamber K to the chamber M, and,so allow. the excess to escape from the chamber K. The passage N to thesuction affords a convenient channel for-carrving oil' theseintermittent discharges -of'excess pressure from chamber K.1

I -prefer to form the sleeve -O of phosphora bronze, so that iiiaddition to the fact that it enables the plug lj to be adjusted readily`from outside therasing, it may protect the shaft fizoinA the actionl ofacidulous water when the pump is used in mines or elsewhere. I claiin'asmy invention ioo j l. In a multistage centrifugal pu'rnp, thevcombination of aeasing, a shaft, a series of impellers on the shaft andaA chamber at the delivery end of the casing, open to a part'of the rearface of thelast iinpel er with a Sleeve tof,

secured on the shaft extending'to the outside l the inside providing aplug to open o1` close of the easing' and on theinside providing a 3said elieinberhy longitudinal movement of plug to open or closeL"sjilidv.chamber by longithe shaft. tudinal movement of the shaft. L

,2. In a multistage 'centrifugal pump, the@ name to this specification,in the eolnbination of a easing, a' shaft, aseiies of two subscribingWitnesses.

4presence of inipellers on the shaft and a chamber at the ELOF .MEDEN ldelivery end ofthe easing open to a part of the rear fe'e of the lastiinpeller with a sleeve i IVitnesses:

secured to and adjustable on the shaft and eX- l C. SEDGWIGK, tending tothe outside of the casing and on HUBERT I-IOWSON.

In testiinony'whereof I ha-ve signed my 15v

